Apparatus and method for transmitting a reservation signal in a wireless communication system

Abstract

The present disclosure is related to a 5th Generation (5G) or pre-5G communication system for supporting a higher data rate than a 4th Generation (4G) communication system such as Long Term Evolution (LTE). A method for operating a terminal in a wireless communication system is provided which includes receiving downlink data from a base station; performing listen-before-talk (LBT) for uplink transmission; transmitting a first reservation signal based on an end timing of the LBT and a subframe boundary; and transmitting uplink data to the base station based on the subframe boundary.

What is claimed is: 
     
       1. A method performed by a terminal in a wireless communication system, the method comprising:
 receiving downlink data from a base station; 
 detecting a first reservation signal in a subframe; 
 performing a listen-before-talk (LBT) in the subframe after detecting the first reservation signal; 
 transmitting a second reservation signal in the subframe based on an end timing of the LBT and a subframe boundary of a next subframe; and 
 transmitting uplink data to the base station based on the subframe boundary, 
 wherein the first reservation signal, the LBT, and the second reservation signal are transmitted in one symbol interval. 
 
     
     
       2. The method of  claim 1 , wherein the subframe is a full subframe or an ending partial subframe. 
     
     
       3. The method of  claim 1 , wherein the second reservation signal comprises a dummy signal or a wireless fidelity (WiFi) preamble, and
 wherein the WiFi preamble contains information about a physical layer (PHY) rate and a frame length. 
 
     
     
       4. The method of  claim 1 , wherein the second reservation signal is transmitted in an interval ranging from the LBT end timing to the subframe boundary. 
     
     
       5. The method of  claim 1 , wherein the first reservation signal comprises a dummy signal or a WiFi preamble. 
     
     
       6. The method of  claim 1 , wherein the first reservation signal is transmitted from the base station directly after transmission of the downlink data ends, and
 the LBT is conducted after the first reservation signal is received. 
 
     
     
       7. A terminal in a wireless communication system, the terminal comprising:
 a transceiver; and 
 at least one processor, operably coupled to the transceiver, configured to: 
 receive downlink data from a base station, 
 detect a first reservation signal in a subframe, 
 perform a listen-before-talk (LBT) in the subframe after detecting the first reservation signal, 
 transmit a second reservation signal in the subframe based on an end timing of the LBT and a subframe boundary of a next subframe, and 
 transmit uplink data to the base station based on the subframe boundary, 
 wherein the first reservation signal, the LBT, and the second reservation signal are transmitted in one symbol interval. 
 
     
     
       8. The terminal of  claim 7 , wherein the subframe containing the subframe boundary is a full subframe or an ending partial subframe. 
     
     
       9. The terminal of  claim 7 , wherein the second reservation signal comprises a dummy signal or a wireless fidelity (WiFi) preamble, and
 wherein the WiFi preamble contains information about a physical layer (PHY) rate and a frame length. 
 
     
     
       10. The terminal of  claim 7 , wherein the second reservation signal is transmitted in an interval ranging from the LBT end timing to the subframe boundary. 
     
     
       11. The terminal of  claim 7 , wherein the first reservation signal comprises a dummy signal or a WiFi preamble. 
     
     
       12. The terminal  claim 7 , wherein the first reservation signal is transmitted from the base station directly after transmission of the downlink data ends, and
 the LBT is conducted after the first reservation signal is received. 
 
     
     
       13. A method performed by a base station in a wireless communication system, the method comprising:
 transmitting downlink data to a terminal in a subframe; 
 transmitting a first reservation signal in a subframe based on a transmission end timing, a certain time, and a subframe boundary; and 
 receiving a second reservation signal in the subframe after a listen-before-talk (LBT) time of the terminal; 
 receiving uplink data from the terminal based on the subframe boundary of a next subframe, 
 wherein the certain time is a LBT time of the terminal to transmit the uplink data, and 
 wherein the first reservation signal, the LBT, and the second reservation signal are transmitted in one symbol interval. 
 
     
     
       14. The method of  claim 13 , wherein the subframe containing the subframe boundary is a full subframe or an ending partial subframe. 
     
     
       15. The method of  claim 13 , wherein the second reservation signal comprises a dummy signal or a wireless fidelity (WiFi) preamble, and
 wherein the WiFi preamble contains information about a physical layer (PHY) rate and a frame length. 
 
     
     
       16. The method of  claim 13 , wherein the second reservation signal is transmitted in an interval ranging from the transmission end timing to a start timing of the downlink data of the certain time, and
 an end timing of the certain time matches the subframe boundary. 
 
     
     
       17. The method of  claim 13 , wherein the second reservation signal comprises a dummy signal or a WiFi preamble. 
     
     
       18. The method of  claim 17 , wherein the first reservation signal is in an interval ranging from an end timing of the certain time to the subframe boundary.